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A pair of funky purple and red trainers added a pop of colour to her ensemble and provided her with the utmost comfort to run as fast as she could.

The actress went mostly make-up free and tied her thick blonde locks into a casual ponytail for a fuss-free look.

Sports chic: The St Trinians star, 28, embraced sports chic as she clad her figure in an oversized white tee and leggings during the gruelling workout

Working out: The British beauty was clad appropriately in a baggy Surf NYC top and skin-tight leggings, with a semi-sheer panel on the side and bright trainers

Tamsin was first spotted with the double pram last month, in confirmation that she had welcomed her second child with beloved beau Josh.

Prior to their outing in Hampstead last month, the actress had last been seen still heavily pregnant in June. MailOnline contacted her representatives at the time.

The couple welcomed their first child in 2015, but her name remains unknown, and the pair continued to remain tight-lipped for the duration of their second pregnancy.

Happy family: Tamsin and Josh welcomed their first child in 2015, but her name remains unknown, and the pair continued to remain tight-lipped for the duration of their second pregnancy

However, Tamsin appeared to confirm she was expecting once again at the Vanity Fair Oscars after-party in February, by poking fun at her pregnancy diet with fellow guests.

According to People, the St Trinians actress had indulged in a few beignets at the bash - before she joked of the fried pastry snack: 'This is not feeding the baby nourishment!'

Last year, Josh spoke about how much he loves being a parent, and gushed having a child had 'put everything into perspective'.

Mum duties: Tamsin was first spotted with the double pram last month, in confirmation that she had welcomed her second child with beloved beau Josh

Speaking on the Live! With Kelly and Michael show, he explained: 'I mean, your ego melts away when you have a new kid. Your heart kind of leaves your body and you give it permission to walk around with someone else for a while.

'It’s really terrifying but it’s beautiful. I love it more than anything. I wish I would have started it earlier. But I’m so glad that she is the one I’m raising.'

Despite admitting having a newborn was tiring, he went on sweetly: 'The best moments are when you have those individual moments alone in the middle of the night.'

Doting dad: Last year, Josh spoke about how much he loves being a parent, and gushed having a child had 'put everything into perspective'